One interesting thing about some of the modern Amtrak trains - at least, the long-distance ones out on the west coast of the U.S. - is their height: they are significantly taller than the somewhat shorter trains of many decades ago, and the more-commuter oriented Amtrak trains of the east coast.
In fact, they are all basically 2-storey trains - the bottom level often being reserved for luggage, bathrooms, and occasional snack facilities, the top levels reserved for regular seating (which is often quite luxurious), for the small sleeper cabins, for larger 'observation' cars with sooooo many windows, and of course for the classic Dining Cars where you can still get served a pretty decent meal on occasion (depending on the train).
When you are standing next to the actual Amtrak train cars, they literally tower over you - in some ways its like being in a smaller mechanical version of Manhattan - but instead of brownstones and skyskrapers, you find yourself in corridors of gleaming, functional metal machinery. It's pretty cool, actually.
This picture - taken in the Amtrak station in Emeryville, also of the Pacific Starlight, making one of its Bay Area stops - gives a sense of the verticality of the train world -